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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the carrying value of goodwill
Changes in the carrying value of goodwill for each reporting unit are as follows (in thousands):
 
Energy Chemistry Technologies
 
Consumer and Industrial Chemistry Technologies
 
 Teledrift®
 
Production Technologies
 
Total
Balance at December 31, 2014
$
36,318

 
$
19,480

 
$
15,333

 
$
—

 
$
71,131

Addition upon acquisition of IAL
—

 
—

 
—

 
1,689

 
1,689

Balance at March 31, 2015
$
36,318

 
$
19,480

 
$
15,333

 
$
1,689

 
$
72,820